/* ============================================================
   Kumar Academy Practice Portal — Global Stylesheet
   ============================================================ */

/* ── Custom properties ────────────────────────────────────── */
:root {
  /* Brand palette */
  --navy:       #0B1F3A;
  --slate:      #0F2C5C;
  --gold:       #F4B619;
  --gold-dark:  #C8950A;
  --gold-light: #FBD767;
  --cream:      #F7F3E9;

  /* Neutral grays */
  --gray-50:   #F9FAFB;
  --gray-100:  #F3F4F6;
  --gray-200:  #E5E7EB;
  --gray-300:  #D1D5DB;
  --gray-400:  #9CA3AF;
  --gray-500:  #6B7280;
  --gray-600:  #4B5563;
  --gray-700:  #374151;
  --gray-800:  #1F2937;
  --gray-900:  #111827;
  --white:     #FFFFFF;

  /* Semantic colors */
  --color-error:      #EF4444;
  --color-error-bg:   #FEF2F2;
  --color-error-bdr:  #FCA5A5;
  --color-success:    #10B981;
  --color-success-bg: #ECFDF5;
  --color-warning:    #F59E0B;

  /* Typography */
  --font-body:    'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;

  --text-xs:   0.75rem;    /*  12px */
  --text-sm:   0.875rem;   /*  14px */
  --text-base: 1rem;       /*  16px */
  --text-lg:   1.125rem;   /*  18px */
  --text-xl:   1.25rem;    /*  20px */
  --text-2xl:  1.5rem;     /*  24px */
  --text-3xl:  1.875rem;   /*  30px */
  --text-4xl:  2.25rem;    /*  36px */

  /* Spacing */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;

  /* Borders */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-2xl: 24px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow-md:  0 4px 12px rgba(0,0,0,.12);
  --shadow-lg:  0 8px 30px rgba(0,0,0,.18);
  --shadow-xl:  0 20px 60px rgba(0,0,0,.28);

  /* Transitions */
  --ease-fast:  150ms ease;
  --ease-base:  200ms ease;
  --ease-slow:  300ms ease;
}

/* ── Reset ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--gray-900);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ── Utilities ────────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ============================================================
   LOGIN PAGE
   ============================================================ */

.page-login {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6) var(--sp-4);
  background: linear-gradient(145deg, var(--navy) 0%, var(--slate) 100%);
  /* Subtle dot-grid texture */
  background-image:
    radial-gradient(circle, rgba(244,182,25,.08) 1px, transparent 1px),
    linear-gradient(145deg, var(--navy) 0%, var(--slate) 100%);
  background-size: 28px 28px, 100% 100%;
}

.login-layout {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-8);
}

/* ── Brand header ─────────────────────────────────────────── */
.login-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  user-select: none;
}

.brand-mark {
  flex-shrink: 0;
  filter: drop-shadow(0 2px 8px rgba(244,182,25,.35));
}

.brand-mark svg {
  border-radius: 12px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -.01em;
  line-height: 1.15;
}

.brand-subtitle {
  font-size: var(--text-sm);
  font-weight: 400;
  color: rgba(247,243,233,.65);
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ── Login card ───────────────────────────────────────────── */
.login-card {
  width: 100%;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  /* Gold top accent bar */
  border-top: 4px solid var(--gold);
}

.login-card-header {
  padding: var(--sp-8) var(--sp-8) var(--sp-6);
  border-bottom: 1px solid var(--gray-100);
}

.login-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: var(--sp-1);
}

.login-subheading {
  font-size: var(--text-sm);
  color: var(--gray-500);
}

/* ── Login form ───────────────────────────────────────────── */
.login-form {
  padding: var(--sp-6) var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.field-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--gray-700);
}

.field-input {
  width: 100%;
  height: 44px;
  padding: 0 var(--sp-4);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--gray-900);
  background: var(--gray-50);
  transition: border-color var(--ease-fast), box-shadow var(--ease-fast), background var(--ease-fast);
  outline: none;
}

.field-input::placeholder { color: var(--gray-400); }

.field-input:hover  {
  border-color: var(--gray-300);
  background: var(--white);
}

.field-input:focus {
  border-color: var(--gold);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(244,182,25,.15);
}

/* Password field with eye toggle */
.field-input-wrap {
  position: relative;
}

.field-input-wrap .field-input {
  padding-right: 2.75rem;
}

.toggle-password {
  position: absolute;
  right: 0;
  top: 0;
  height: 44px;
  width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--gray-400);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: color var(--ease-fast);
}

.toggle-password:hover { color: var(--gray-700); }
.toggle-password:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
  border-radius: var(--radius-md);
}

/* ── Error alert ──────────────────────────────────────────── */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.alert-error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-bdr);
  color: #B91C1C;
}

.alert-error svg {
  flex-shrink: 0;
  margin-top: 1px;
  stroke: #B91C1C;
}

/* ── Submit button ────────────────────────────────────────── */
.btn-primary {
  width: 100%;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0 var(--sp-6);
  background: var(--gold);
  color: var(--navy);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: .01em;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--ease-fast), transform var(--ease-fast), box-shadow var(--ease-fast);
  box-shadow: 0 2px 8px rgba(244,182,25,.35);
}

.btn-primary:hover:not(:disabled) {
  background: var(--gold-dark);
  box-shadow: 0 4px 16px rgba(244,182,25,.45);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(244,182,25,.3);
}

.btn-primary:disabled {
  opacity: .7;
  cursor: not-allowed;
}

.btn-primary:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

/* Spinner inside the button */
.spinner {
  animation: spin 900ms linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg);   }
  to   { transform: rotate(360deg); }
}

/* ── Card footer ──────────────────────────────────────────── */
.login-card-footer {
  padding: var(--sp-5) var(--sp-8) var(--sp-7);
  text-align: center;
}

.tutor-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--gray-500);
  transition: color var(--ease-fast);
}

.tutor-link:hover {
  color: var(--navy);
}

.tutor-link svg {
  transition: transform var(--ease-fast);
}

.tutor-link:hover svg {
  transform: translateX(2px);
}

/* ── Page footer ──────────────────────────────────────────── */
.login-footer {
  font-size: var(--text-xs);
  color: rgba(247,243,233,.4);
  text-align: center;
}

/* ── Responsive tweaks ────────────────────────────────────── */
@media (max-width: 480px) {
  .login-card-header,
  .login-form,
  .login-card-footer { padding-left: var(--sp-6); padding-right: var(--sp-6); }

  .brand-name { font-size: var(--text-xl); }
}

/* ============================================================
   SHARED COMPONENTS (used across all pages)
   ============================================================ */

/* Nav sidebar placeholder — styles will be added when dashboard is built */

/* Button variants */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  height: 40px;
  padding: 0 var(--sp-5);
  background: var(--white);
  color: var(--navy);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--ease-fast), border-color var(--ease-fast);
}

.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-300);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--sp-2);
  border-radius: 99px;
  font-size: var(--text-xs);
  font-weight: 600;
}

.badge-easy   { background: #DCFCE7; color: #15803D; }
.badge-medium { background: #FEF9C3; color: #92400E; }
.badge-hard   { background: #FEE2E2; color: #991B1B; }
.badge-gold   { background: rgba(244,182,25,.15); color: #92400E; }

/* Card base */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

/* Gold accent divider */
.divider-gold {
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 100%);
  border-radius: 99px;
}

/* ============================================================
   TOP NAV
   ============================================================ */

.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  border-bottom: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 2px 12px rgba(0,0,0,.2);
}

.topnav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
  height: 64px;
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.topnav-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark-sm {
  width: 34px;
  height: 34px;
  background: var(--gold);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -.5px;
  flex-shrink: 0;
}

.topnav-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--white);
  white-space: nowrap;
}

.topnav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex: 1;
}

.topnav-links a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,.65);
  text-decoration: none;
  transition: color var(--ease-fast), background var(--ease-fast);
  white-space: nowrap;
}

.topnav-links a:hover { color: var(--white); background: rgba(255,255,255,.07); }
.topnav-links a.active { color: var(--gold); background: rgba(244,182,25,.1); }

.topnav-user {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-left: auto;
  flex-shrink: 0;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--navy);
  font-weight: 700;
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  user-select: none;
}

.user-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,.85);
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-signout {
  height: 32px;
  padding: 0 var(--sp-4);
  background: transparent;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: var(--radius-md);
  color: rgba(255,255,255,.7);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--ease-fast), border-color var(--ease-fast), color var(--ease-fast);
  white-space: nowrap;
}

.btn-signout:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.4);
  color: var(--white);
}

/* ============================================================
   DASHBOARD PAGE SHELL
   ============================================================ */

.page-dashboard { background: var(--gray-50); min-height: 100vh; }

.dashboard-body { padding: var(--sp-8) var(--sp-6); }

.dashboard-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

/* ── Greeting ─────────────────────────────────────────────── */
.greeting-section { padding-bottom: var(--sp-2); }

.greeting-heading {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.15;
  margin-bottom: var(--sp-2);
}

.greeting-name  { color: var(--gold); }

.greeting-sub {
  font-size: var(--text-base);
  color: var(--gray-500);
}

/* ── Main grid ────────────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--sp-6);
  align-items: start;
}

/* ============================================================
   ASSIGNMENTS CARD
   ============================================================ */

.assignments-card { padding: 0; overflow: hidden; }

.card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  padding: var(--sp-6);
  border-bottom: 1px solid var(--gray-100);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-icon--navy { background: rgba(11,31,58,.08); color: var(--navy); }
.card-icon--gold { background: rgba(244,182,25,.12); color: #92400E; }

.card-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: var(--sp-1);
}

.card-subtitle { font-size: var(--text-sm); color: var(--gray-500); line-height: 1.4; }

.assignment-list { display: flex; flex-direction: column; }

.assignment-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-6);
  border-bottom: 1px solid var(--gray-100);
  transition: background var(--ease-fast);
}

.assignment-item:last-child { border-bottom: none; }
.assignment-item:hover { background: var(--gray-50); }

.assignment-item-main {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-width: 0;
}

.assignment-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}

.assignment-dot--done    { background: var(--color-success); }
.assignment-dot--overdue { background: var(--color-error); }

.assignment-title-text {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.assignment-meta { font-size: var(--text-xs); color: var(--gray-500); margin-top: 2px; }

.assignment-item-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

.btn-sm {
  height: 30px;
  padding: 0 var(--sp-3);
  background: var(--navy);
  color: var(--white);
  font-size: var(--text-xs);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: background var(--ease-fast);
  white-space: nowrap;
}

.btn-sm:hover { background: var(--slate); }

.btn-sm--ghost {
  background: transparent;
  color: var(--gray-500);
  border: 1px solid var(--gray-200);
}

.btn-sm--ghost:hover { background: var(--gray-100); color: var(--gray-700); }

.badge-success  { background: #DCFCE7; color: #15803D; }
.badge-warning  { background: #FEF9C3; color: #854D0E; }
.badge-error    { background: #FEE2E2; color: #991B1B; }
.badge-neutral  { background: var(--gray-100); color: var(--gray-600); }

.card-footer-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  padding: var(--sp-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--navy);
  text-decoration: none;
  border-top: 1px solid var(--gray-100);
  transition: background var(--ease-fast);
}

.card-footer-link:hover { background: var(--gray-50); }

/* ============================================================
   QUICK ACTION CARDS
   ============================================================ */

.quick-actions { display: flex; flex-direction: column; gap: var(--sp-5); }

.quick-card {
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  transition: box-shadow var(--ease-base), transform var(--ease-base);
}

.quick-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.quick-card-top {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
}

.quick-card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-lg);
  background: rgba(11,31,58,.07);
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.quick-card-icon--gold { background: rgba(244,182,25,.12); color: #92400E; }

.quick-card-label {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--sp-1);
}

.quick-card-sub { font-size: var(--text-sm); color: var(--gray-500); line-height: 1.4; }

.quick-card .btn-primary { height: 40px; font-size: var(--text-sm); }

/* ============================================================
   ANALYTICS PREVIEW
   ============================================================ */

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-5);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
}

.section-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--navy);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  opacity: .7;
  transition: opacity var(--ease-fast);
}

.section-link:hover { opacity: 1; }

.analytics-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--sp-5);
  align-items: start;
}

.analytics-card { padding: var(--sp-5); }

.analytics-card-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.analytics-legend { display: flex; gap: var(--sp-4); margin-bottom: var(--sp-3); }

.legend-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  color: var(--gray-500);
}

.chart-wrap { position: relative; height: 180px; width: 100%; }

.chart-wrap--ring { height: 150px; width: 150px; margin: 0 auto; }

.ring-no-data {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
}

.ring-no-data-pct  { font-size: var(--text-2xl); font-weight: 700; color: var(--gray-300); }
.ring-no-data-label { font-size: var(--text-xs); color: var(--gray-400); }

/* ── Empty state ──────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  padding: var(--sp-12) var(--sp-8);
  text-align: center;
}

.empty-state-icon {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-400);
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-state-title { font-size: var(--text-base); font-weight: 600; color: var(--gray-700); }
.empty-state-sub   { font-size: var(--text-sm); color: var(--gray-400); max-width: 280px; line-height: 1.5; }

/* ============================================================
   SKELETON LOADERS
   ============================================================ */

@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position:  400px 0; }
}

.skeleton {
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 800px 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-6);
  border-bottom: 1px solid var(--gray-100);
}

.skeleton-item:last-child { border-bottom: none; }

.skeleton-dot  { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.skeleton-line { height: 13px; flex: 1; }
.skeleton-line--sm { height: 11px; width: 80px; flex: none; }

/* ============================================================
   RESPONSIVE — DASHBOARD
   ============================================================ */

@media (max-width: 900px) {
  .dashboard-grid { grid-template-columns: 1fr; }

  .analytics-grid { grid-template-columns: 1fr 1fr; }
  .analytics-grid > .analytics-card:first-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .dashboard-body { padding: var(--sp-5) var(--sp-4); }
  .dashboard-container { gap: var(--sp-6); }
  .greeting-heading { font-size: var(--text-3xl); }
  .topnav-links { display: none; }
  .user-name    { display: none; }
  .topnav-inner { gap: var(--sp-4); }
  .analytics-grid { grid-template-columns: 1fr; }
  .analytics-grid > .analytics-card:first-child { grid-column: 1; }
  .assignment-item { flex-direction: column; align-items: flex-start; gap: var(--sp-3); }
  .assignment-item-actions { width: 100%; justify-content: space-between; }
}

/* ============================================================
   PRACTICE PAGE — FILTER MODAL
   ============================================================ */

.practice-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11,31,58,.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
}

.practice-modal {
  background: var(--white);
  border-radius: var(--radius-2xl);
  padding: var(--sp-8);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-xl);
  border-top: 4px solid var(--gold);
}

.practice-modal-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--sp-2);
}

.practice-modal-sub {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-bottom: var(--sp-6);
}

.filter-section { margin-bottom: var(--sp-5); }

.filter-section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
  margin-bottom: var(--sp-3);
}

/* Subject cards */
.subject-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
}

.subject-card {
  position: relative;
  cursor: pointer;
}

.subject-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0; height: 0;
}

.subject-card-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-3);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--ease-fast), background var(--ease-fast);
}

.subject-card input:checked + .subject-card-inner {
  border-color: var(--gold);
  background: rgba(244,182,25,.07);
}

.subject-card-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.subject-card-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--navy);
}

.subject-card-sub {
  font-size: var(--text-xs);
  color: var(--gray-500);
}

/* Difficulty pills */
.difficulty-pills {
  display: flex;
  gap: var(--sp-2);
}

.diff-pill {
  position: relative;
  flex: 1;
}

.diff-pill input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0; height: 0;
}

.diff-pill-label {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  border: 2px solid var(--gray-200);
  border-radius: 99px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--gray-600);
  cursor: pointer;
  transition: border-color var(--ease-fast), background var(--ease-fast), color var(--ease-fast);
}

.diff-pill input:checked + .diff-pill-label {
  border-color: var(--gold);
  background: rgba(244,182,25,.08);
  color: var(--navy);
  font-weight: 700;
}

/* Topic select */
.filter-select {
  width: 100%;
  height: 44px;
  padding: 0 var(--sp-4);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--gray-800);
  background: var(--gray-50);
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239CA3AF' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
  transition: border-color var(--ease-fast);
}

.filter-select:focus { border-color: var(--gold); background-color: var(--white); }

/* ============================================================
   PRACTICE PAGE — SHELL & TOP BAR
   ============================================================ */

.page-practice {
  background: #f0f2f8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.practice-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--white);
  box-shadow: 0 1px 4px rgba(0,0,0,.09);
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 var(--sp-6);
  gap: var(--sp-4);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-width: 0;
  flex: 1;
}

.topbar-back {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  height: 32px;
  padding: 0 var(--sp-3);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: background var(--ease-fast), color var(--ease-fast);
  white-space: nowrap;
}

.topbar-back:hover { background: var(--gray-50); color: var(--gray-900); }

.topbar-section {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--navy);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-center { flex: 1; display: flex; justify-content: center; }

.timer {
  font-size: var(--text-xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
  color: var(--navy);
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 4px 14px;
  transition: color var(--ease-base), border-color var(--ease-base), background var(--ease-base);
}

.timer.timer--urgent {
  color: var(--gold-dark);
  border-color: var(--gold);
  background: rgba(244,182,25,.08);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex: 1;
  justify-content: flex-end;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  height: 34px;
  padding: 0 var(--sp-3);
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--gray-700);
  cursor: pointer;
  transition: background var(--ease-fast), border-color var(--ease-fast), color var(--ease-fast);
  white-space: nowrap;
}

.tool-btn:hover { background: var(--white); border-color: var(--gray-300); color: var(--navy); }
.tool-btn.tool-btn--active {
  background: rgba(11,31,58,.07);
  border-color: var(--navy);
  color: var(--navy);
}

.topbar-counter {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--gray-400);
  white-space: nowrap;
  padding: 0 var(--sp-2);
}

/* ============================================================
   PRACTICE PAGE — BODY / LAYOUTS
   ============================================================ */

.practice-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--sp-5) var(--sp-6);
  gap: var(--sp-4);
  overflow: hidden;
}

/* ── R&W Split Panel ──────────────────────────────────────── */
.rw-layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

.split-panel {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 5px 1fr;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  min-height: 0;
}

.split-panel.passage-collapsed {
  grid-template-columns: 0px 5px 1fr;
}

.panel-passage {
  overflow-y: auto;
  padding: var(--sp-8);
  transition: padding var(--ease-slow);
  min-width: 0;
}

.split-panel.passage-collapsed .panel-passage {
  padding: 0;
  overflow: hidden;
}

.passage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-5);
}

.passage-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--gray-400);
}

.highlight-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: #92400E;
  background: rgba(244,182,25,.15);
  border-radius: 99px;
  padding: 2px 10px;
}

.passage-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray-800);
}

.passage-body mark {
  background: rgba(255,214,0,.45);
  border-radius: 2px;
  cursor: pointer;
  padding: 0 1px;
}

.panel-divider {
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: col-resize;
  transition: background var(--ease-fast);
}

.panel-divider:hover { background: var(--gray-200); }

.collapse-btn {
  width: 20px;
  height: 40px;
  background: var(--gray-200);
  border: none;
  border-radius: 10px;
  color: var(--gray-500);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--ease-fast), color var(--ease-fast);
  padding: 0;
  line-height: 1;
}

.collapse-btn:hover { background: var(--gray-300); color: var(--navy); }

.panel-question {
  overflow-y: auto;
  padding: var(--sp-8);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ── Math Full Panel ──────────────────────────────────────── */
.math-layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

.math-full-card {
  flex: 1;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--sp-10);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

/* ============================================================
   QUESTION CONTENT (shared by both layouts)
   ============================================================ */

.question-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}

.question-domain-label {
  font-size: var(--text-xs);
  color: var(--gray-500);
  font-weight: 500;
}

.question-text {
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-900);
  margin-bottom: var(--sp-6);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Answer choices */
.answer-choices {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}

.answer-choice {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-5);
  border: 2px solid var(--gray-200);
  border-radius: 99px;
  min-height: 52px;
  cursor: pointer;
  background: var(--white);
  transition: border-color var(--ease-fast), background var(--ease-fast);
  text-align: left;
  font-size: 15px;
  line-height: 1.4;
  color: var(--gray-800);
}

.answer-choice:hover:not(.is-selected):not(.is-correct):not(.is-wrong):not(:disabled) {
  border-color: var(--gray-300);
  background: var(--gray-50);
}

.answer-choice:disabled { cursor: default; }

.answer-choice.is-selected {
  border-color: var(--gold);
  background: rgba(244,182,25,.06);
}

.answer-choice.is-correct {
  border-color: #1D7A3A;
  background: rgba(29,122,58,.06);
}

.answer-choice.is-wrong {
  border-color: #C0392B;
  background: rgba(192,57,43,.06);
}

.choice-letter {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-700);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px;
  flex-shrink: 0;
  transition: background var(--ease-fast), color var(--ease-fast);
}

.is-selected  .choice-letter { background: var(--gold); color: var(--navy); }
.is-correct   .choice-letter { background: #1D7A3A; color: var(--white); }
.is-wrong     .choice-letter { background: #C0392B; color: var(--white); }

.choice-icon {
  margin-left: auto;
  flex-shrink: 0;
  display: none;
}

.is-correct .choice-icon { display: flex; color: #1D7A3A; }
.is-wrong   .choice-icon { display: flex; color: #C0392B; }

/* Rationale */
.rationale-box {
  margin-top: var(--sp-2);
  padding: var(--sp-4) var(--sp-5);
  background: var(--gray-50);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-sm);
  color: var(--gray-700);
  line-height: 1.6;
}

.rationale-label {
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--sp-2);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ============================================================
   PRACTICE PAGE — BOTTOM BAR
   ============================================================ */

.practice-bottombar {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-6);
  background: transparent;
}

.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  height: 38px;
  padding: 0 var(--sp-4);
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: 99px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--gray-700);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--ease-fast), border-color var(--ease-fast), color var(--ease-fast);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

.pill-btn:hover {
  background: var(--gray-50);
  border-color: var(--gray-300);
  color: var(--navy);
}

.filter-pill-current {
  flex: 1;
  justify-content: center;
}

#actionBtn {
  height: 44px;
  padding: 0 var(--sp-8);
  border-radius: 99px;
  font-size: var(--text-sm);
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: background var(--ease-fast), box-shadow var(--ease-fast), transform var(--ease-fast);
  white-space: nowrap;
}

#actionBtn:disabled {
  background: var(--gray-200);
  color: var(--gray-400);
  cursor: not-allowed;
  box-shadow: none;
}

#actionBtn:not(:disabled) {
  background: var(--gold);
  color: var(--navy);
  box-shadow: 0 2px 8px rgba(244,182,25,.4);
}

#actionBtn:not(:disabled):hover {
  background: var(--gold-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(244,182,25,.45);
}

#actionBtn.btn--next {
  background: var(--navy);
  color: var(--white);
  box-shadow: 0 2px 8px rgba(11,31,58,.25);
}

#actionBtn.btn--next:not(:disabled):hover {
  background: var(--slate);
  transform: translateY(-1px);
}

/* ============================================================
   FLOATING WIDGETS (Calculator, Reference, Notes)
   ============================================================ */

.floating-widget {
  position: fixed;
  z-index: 300;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: 0 12px 48px rgba(0,0,0,.22);
  overflow: hidden;
  min-width: 280px;
}

.floating-header {
  background: var(--navy);
  color: var(--white);
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: grab;
  user-select: none;
  gap: var(--sp-3);
}

.floating-header:active { cursor: grabbing; }

.floating-title {
  font-size: var(--text-sm);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.floating-close {
  background: rgba(255,255,255,.15);
  border: none;
  color: var(--white);
  width: 24px; height: 24px;
  border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  line-height: 1;
  transition: background var(--ease-fast);
  padding: 0;
  flex-shrink: 0;
}

.floating-close:hover { background: rgba(255,255,255,.3); }

/* Calculator widget */
#calcWidget {
  top: 80px;
  right: 24px;
  width: 500px;
}

#desmos-container {
  width: 100%;
  height: 380px;
}

/* Reference widget */
#refWidget {
  top: 80px;
  left: 24px;
  width: 340px;
  max-height: calc(100vh - 120px);
}

.reference-body {
  padding: var(--sp-4);
  overflow-y: auto;
  max-height: calc(100vh - 200px);
}

.ref-section-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--gray-500);
  margin: var(--sp-4) 0 var(--sp-3);
}

.ref-section-title:first-child { margin-top: 0; }

.ref-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2);
  margin-bottom: var(--sp-2);
}

.ref-formula {
  background: var(--gray-50);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
}

.ref-formula-name {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.ref-formula-eq {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--navy);
}

.ref-formula-full {
  grid-column: 1 / -1;
}

.ref-divider {
  height: 1px;
  background: var(--gray-100);
  margin: var(--sp-3) 0;
}

.ref-fact {
  font-size: var(--text-xs);
  color: var(--gray-600);
  padding: var(--sp-2) var(--sp-3);
  background: rgba(244,182,25,.07);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-2);
}

/* Notes widget */
#notesWidget {
  bottom: 80px;
  right: 24px;
  width: 300px;
}

.notes-area {
  width: 100%;
  height: 180px;
  padding: var(--sp-4);
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--gray-800);
  line-height: 1.6;
}

/* ============================================================
   PRACTICE — EMPTY / DONE / LOADING STATES
   ============================================================ */

.practice-empty,
.practice-done {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.practice-loading-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.practice-loading-wrap .spinner {
  animation: spin 900ms linear infinite;
  color: var(--navy);
}

/* ============================================================
   ANALYTICS PAGE
   ============================================================ */

/* ── Page shell ─────────────────────────────────────────────── */
.page-analytics {
  background: var(--cream);
  min-height: 100vh;
}

.analytics-body {
  padding: var(--sp-8) var(--sp-6) var(--sp-16);
}

.analytics-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

/* ── Page header ────────────────────────────────────────────── */
.analytics-page-header {
  padding-bottom: var(--sp-2);
}

.analytics-page-header .page-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: var(--sp-1);
}

.analytics-page-header .page-subtitle {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-bottom: var(--sp-5);
}

/* ── Tab nav ────────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--gray-100);
}

.tab-btn {
  padding: var(--sp-2) var(--sp-5);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-500);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  letter-spacing: .02em;
}

.tab-btn:hover {
  color: var(--navy);
}

.tab-btn.active {
  color: var(--navy);
  border-bottom-color: var(--gold);
}

/* ── Section cards ──────────────────────────────────────────── */
.analytics-section-card {
  padding: var(--sp-7) var(--sp-7) var(--sp-8);
}

.analytics-section-heading-row {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  margin-bottom: var(--sp-6);
}

.analytics-section-heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--navy);
}

/* ── Combo chart (Section 1) ────────────────────────────────── */
.combo-chart-wrap {
  position: relative;
  height: 220px;
  margin-bottom: var(--sp-5);
}

.chart-stats-row {
  display: flex;
  gap: var(--sp-8);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--gray-100);
}

.chart-stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chart-stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
}

.chart-stat-label {
  font-size: var(--text-xs);
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 600;
}

/* ── Subject rings (Section 2) ──────────────────────────────── */
.rings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5);
}

.ring-card-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
}

.ring-chart-wrap {
  position: relative;
  width: 160px;
  height: 160px;
}

.ring-chart-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-600);
  text-align: center;
}

/* ── Lollipop chart (Section 3) ─────────────────────────────── */
.lollipop-wrap {
  position: relative;
  height: 200px;
  padding-top: 20px; /* room for dot overflow */
}

/* ── Domain table (Section 4) ───────────────────────────────── */
.analytics-table-wrap {
  overflow-x: auto;
}

.analytics-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.analytics-table thead th {
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
  padding: var(--sp-2) var(--sp-4);
  border-bottom: 2px solid var(--gray-100);
}

.analytics-table thead th:not(:first-child) {
  text-align: center;
}

.analytics-table tbody tr {
  border-bottom: 1px solid var(--gray-100);
  transition: background var(--transition-fast);
}

.analytics-table tbody tr:hover {
  background: rgba(11,31,58,.025);
}

.analytics-table tbody tr:last-child {
  border-bottom: none;
}

.analytics-table tbody td {
  padding: var(--sp-3) var(--sp-4);
  color: var(--navy);
  vertical-align: middle;
}

.analytics-table tbody td:not(:first-child) {
  text-align: center;
}

.table-domain-cell {
  font-weight: 600;
  color: var(--navy);
}

.table-subdomain-cell {
  color: var(--gray-500);
}

/* Accuracy chips */
.accuracy-chip {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 700;
  line-height: 1.6;
}

.accuracy--green {
  background: rgba(16,185,129,.12);
  color: #065F46;
}

.accuracy--yellow {
  background: rgba(245,158,11,.14);
  color: #92400E;
}

.accuracy--red {
  background: rgba(239,68,68,.12);
  color: #991B1B;
}

.accuracy--none {
  background: var(--gray-100);
  color: var(--gray-500);
}

/* ── Exam results table (Section 5) ─────────────────────────── */
.exam-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--sp-12) var(--sp-8);
  gap: var(--sp-3);
}

.exam-empty-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(11,31,58,.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
}

.exam-empty-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--navy);
}

.exam-empty-sub {
  font-size: var(--text-sm);
  color: var(--gray-500);
  max-width: 340px;
}

.exam-score-total {
  font-weight: 700;
  color: var(--navy);
}

/* ── Skeleton shimmers (analytics) ─────────────────────────── */
.analytics-skeleton-chart {
  height: 220px;
  border-radius: var(--radius-lg);
}

.analytics-skeleton-ring {
  width: 160px;
  height: 160px;
  border-radius: 50%;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .analytics-body {
    padding: var(--sp-5) var(--sp-4) var(--sp-12);
  }

  .analytics-section-card {
    padding: var(--sp-5);
  }

  .rings-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }

  .combo-chart-wrap {
    height: 180px;
  }

  .lollipop-wrap {
    height: 160px;
  }

  .chart-stats-row {
    gap: var(--sp-5);
  }
}

/* ============================================================
   ASSIGNMENTS PAGE
   ============================================================ */

/* ── Page shell ─────────────────────────────────────────────── */
.page-assignments {
  background: var(--cream);
  min-height: 100vh;
}

.assignments-body {
  padding: var(--sp-8) var(--sp-6) var(--sp-16);
}

.assignments-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

/* ── Page header ────────────────────────────────────────────── */
.assignments-page-header .page-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: var(--sp-1);
}

.assignments-page-header .page-subtitle {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-bottom: var(--sp-5);
}

/* ── Filter tab nav ─────────────────────────────────────────── */
.asgn-tab-nav {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--gray-100);
}

.asgn-tab-btn {
  padding: var(--sp-2) var(--sp-5);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-500);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.asgn-tab-btn:hover { color: var(--navy); }

.asgn-tab-btn.active {
  color: var(--navy);
  border-bottom-color: var(--gold);
}

/* Count badge inside tab */
.asgn-tab-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 700;
  background: var(--gray-100);
  color: var(--gray-500);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.asgn-tab-btn.active .asgn-tab-count {
  background: rgba(244,182,25,.18);
  color: #92400E;
}

/* ── Assignment card ────────────────────────────────────────── */
.asgn-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow: hidden;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.asgn-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.asgn-card-body {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-5) var(--sp-6);
}

/* Left info block */
.asgn-card-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.asgn-card-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.asgn-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
}

.asgn-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: var(--text-xs);
  color: var(--gray-500);
}

.asgn-meta-item svg {
  flex-shrink: 0;
  opacity: .7;
}

/* Due date coloring */
.asgn-due--overdue  { color: #DC2626; font-weight: 600; }
.asgn-due--today    { color: #D97706; font-weight: 600; }
.asgn-due--soon     { color: var(--gray-600); }
.asgn-due--upcoming { color: var(--gray-500); }

/* Right action block */
.asgn-card-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--sp-3);
  flex-shrink: 0;
}

/* Status badge */
.asgn-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.6;
}

.asgn-badge--not-started {
  background: var(--gray-100);
  color: var(--gray-500);
}

.asgn-badge--in-progress {
  background: rgba(244,182,25,.16);
  color: #92400E;
}

.asgn-badge--completed {
  background: rgba(16,185,129,.14);
  color: #065F46;
}

/* Action buttons row */
.asgn-btn-row {
  display: flex;
  gap: var(--sp-2);
}

/* ── Progress bar strip ─────────────────────────────────────── */
.asgn-progress-strip {
  height: 4px;
  background: var(--gray-100);
  width: 100%;
}

.asgn-progress-fill {
  height: 100%;
  background: var(--gold);
  border-radius: 0 2px 2px 0;
  transition: width .4s ease;
}

.asgn-progress-fill--complete {
  background: #10B981;
}

/* ── Skeleton cards ─────────────────────────────────────────── */
.asgn-skeleton-card {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

/* ── Empty / filtered-empty states ─────────────────────────── */
.asgn-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--sp-14) var(--sp-8);
  gap: var(--sp-3);
}

.asgn-empty-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(11,31,58,.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
}

.asgn-empty-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--navy);
}

.asgn-empty-sub {
  font-size: var(--text-sm);
  color: var(--gray-500);
  max-width: 320px;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .assignments-body { padding: var(--sp-5) var(--sp-4) var(--sp-12); }

  .asgn-card-body {
    flex-direction: column;
    gap: var(--sp-4);
  }

  .asgn-card-actions {
    flex-direction: row;
    align-items: center;
    width: 100%;
    justify-content: space-between;
  }

  .asgn-tab-btn { padding: var(--sp-2) var(--sp-3); }
}

/* ============================================================
   TUTOR PORTAL
   ============================================================ */

/* ── Page shell ─────────────────────────────────────────────── */
.page-tutor {
  background: var(--cream);
  min-height: 100vh;
}

.tutor-body {
  padding: var(--sp-8) var(--sp-6) var(--sp-16);
}

.tutor-container {
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-7);
}

/* ── Quick stats bar ────────────────────────────────────────── */
.tutor-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
}

.tutor-stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding: var(--sp-5) var(--sp-6);
  border-left: 3px solid var(--gold);
}

.tutor-stat-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
}

.tutor-stat-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
}

/* ── Students section ───────────────────────────────────────── */
.students-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.students-section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
}

.students-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-4);
}

/* ── Student card ───────────────────────────────────────────── */
.student-card {
  cursor: pointer;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  padding: var(--sp-5) var(--sp-6) var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.student-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.student-card-header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.student-card-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy) 0%, #1e4080 100%);
  color: var(--gold);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  user-select: none;
}

.student-card-name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.25;
  margin-bottom: 2px;
}

.student-card-meta {
  font-size: var(--text-xs);
  color: var(--gray-500);
}

/* Subject accuracy mini row */
.student-card-subjects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2);
}

.student-subject-chip {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-lg);
  background: var(--gray-50);
}

.student-subject-chip-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
}

.student-subject-chip-val {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--navy);
}

/* Footer row: total + last active */
.student-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--gray-100);
  font-size: var(--text-xs);
  color: var(--gray-500);
}

.student-card-footer strong {
  color: var(--navy);
  font-weight: 600;
}

/* ── Student detail overlay ─────────────────────────────────── */
.detail-overlay {
  position: fixed;
  inset: 0;
  z-index: 600;
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
}

.detail-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(11,31,58,.5);
  backdrop-filter: blur(3px);
  cursor: pointer;
}

.detail-panel {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 780px;
  background: var(--cream);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateX(100%);
  transition: transform .3s cubic-bezier(.25,.46,.45,.94);
}

.detail-panel.is-open {
  transform: translateX(0);
}

.detail-panel-header {
  padding: var(--sp-5) var(--sp-6);
  border-bottom: 1px solid var(--gray-100);
  background: var(--white);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.detail-close-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-500);
  padding: 0;
  transition: color var(--transition-fast);
}

.detail-close-btn:hover { color: var(--navy); }

.detail-student-hero {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.detail-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy) 0%, #1e4080 100%);
  color: var(--gold);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.detail-student-name {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
}

.detail-student-sub {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-top: 2px;
}

.detail-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

/* Summary stat row at top of detail */
.detail-summary-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
}

.detail-summary-stat {
  padding: var(--sp-4) var(--sp-5);
  border-left: 3px solid var(--gold);
}

.detail-summary-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--navy);
  font-family: var(--font-display);
  line-height: 1;
  margin-bottom: 3px;
}

.detail-summary-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
}

.detail-section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--sp-5);
}

/* Recent answers table */
.recent-answers-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.recent-answer-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-2);
  border-bottom: 1px solid var(--gray-100);
  font-size: var(--text-sm);
}

.recent-answer-row:last-child { border-bottom: none; }

.answer-correct-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.answer-correct-dot--yes { background: #10B981; }
.answer-correct-dot--no  { background: #EF4444; }

.recent-answer-text {
  color: var(--navy);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.recent-answer-chosen {
  font-weight: 700;
  color: var(--gray-600);
  flex-shrink: 0;
}

.recent-answer-date {
  font-size: var(--text-xs);
  color: var(--gray-400);
  flex-shrink: 0;
}

/* ── Assignment modal ───────────────────────────────────────── */
.assign-overlay {
  position: fixed;
  inset: 0;
  z-index: 700;
  background: rgba(11,31,58,.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--sp-8) var(--sp-6);
  overflow-y: auto;
}

.assign-modal {
  background: var(--white);
  border-radius: var(--radius-2xl);
  border-top: 4px solid var(--gold);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.assign-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-6) var(--sp-7);
  border-bottom: 1px solid var(--gray-100);
}

.assign-modal-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--navy);
}

.assign-modal-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--gray-100);
  color: var(--gray-500);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.assign-modal-close:hover {
  background: var(--gray-200);
  color: var(--navy);
}

.assign-modal-body {
  padding: var(--sp-6) var(--sp-7);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.assign-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}

.assign-form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.assign-form-group label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
}

.assign-form-group select,
.assign-form-group input[type="text"],
.assign-form-group input[type="date"] {
  padding: var(--sp-3) var(--sp-4);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  color: var(--navy);
  background: var(--white);
  transition: border-color var(--transition-fast);
  width: 100%;
}

.assign-form-group select:focus,
.assign-form-group input:focus {
  outline: none;
  border-color: var(--navy);
}

/* Question filter bar */
.q-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--gray-50);
  border-radius: var(--radius-lg);
}

.q-filter-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
  min-width: 100px;
}

.q-filter-group label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
}

.q-filter-group select {
  padding: var(--sp-2) var(--sp-3);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  color: var(--navy);
  background: var(--white);
  cursor: pointer;
}

/* Question list */
.q-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--gray-100);
}

.q-selected-count {
  color: var(--navy);
}

.q-list {
  max-height: 260px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
}

.q-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--gray-100);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.q-row:last-child { border-bottom: none; }

.q-row:hover { background: rgba(11,31,58,.03); }

.q-row.is-selected { background: rgba(244,182,25,.08); }

.q-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--navy);
  cursor: pointer;
  flex-shrink: 0;
}

.q-row-info {
  min-width: 0;
}

.q-row-text {
  font-size: var(--text-sm);
  color: var(--navy);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.q-row-sub {
  font-size: var(--text-xs);
  color: var(--gray-400);
  margin-top: 1px;
}

.q-diff-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
  flex-shrink: 0;
}

.q-diff-badge--Easy   { background: rgba(16,185,129,.14); color: #065F46; }
.q-diff-badge--Medium { background: rgba(245,158,11,.14);  color: #92400E; }
.q-diff-badge--Hard   { background: rgba(239,68,68,.12);   color: #991B1B; }

.q-empty-msg {
  text-align: center;
  padding: var(--sp-8);
  color: var(--gray-400);
  font-size: var(--text-sm);
}

/* Modal footer */
.assign-modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--sp-3);
  padding: var(--sp-5) var(--sp-7);
  border-top: 1px solid var(--gray-100);
  background: var(--gray-50);
}

/* ── Toast notifications ─────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  max-width: 340px;
  pointer-events: auto;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease;
}

.toast.toast--visible {
  opacity: 1;
  transform: translateY(0);
}

.toast--success {
  background: #ECFDF5;
  color: #065F46;
  border: 1px solid rgba(16,185,129,.3);
}

.toast--error {
  background: #FEF2F2;
  color: #991B1B;
  border: 1px solid rgba(239,68,68,.3);
}

/* ── Tutor nav brand accent ──────────────────────────────────── */
.topnav--tutor .brand-mark-sm {
  background: var(--gold);
  color: var(--navy);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  .tutor-stats-bar { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .tutor-body { padding: var(--sp-5) var(--sp-4) var(--sp-12); }
  .tutor-stats-bar { grid-template-columns: repeat(2, 1fr); gap: var(--sp-3); }
  .students-grid { grid-template-columns: 1fr; }
  .detail-panel { max-width: 100%; }
  .assign-form-row { grid-template-columns: 1fr; }
  .detail-summary-row { grid-template-columns: repeat(2, 1fr); }
}